Which Condition Does NOT Characterize a Pre-Main-Sequence Star in Its

Which condition does NOT characterize a pre-main-sequence star in its final stages?

A) The star is fusing hydrogen into helium in its core.
B) The star is no longer contracting.
C) The gas and dust around the pre-main-sequence star have largely dissipated.
D) Helium burning has begun as the principal energy generating mechanism in the star's core.

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